PROBLEM TO BE SOLVED: To form a screen with fluid while suppressing generation of a blank space in a peripheral part of a projected image.;SOLUTION: A screen formation device 3 includes a generation part 301, and an ejection part 303 which is communicated with the generation part 301 via a duct 302. The generation part 301 generates mist with ultrasonic vibration. The mist 311 supplied into a chamber 312 via the duct 302 with the rotation of a main fan 310 is blown to the upper side of each of individual fans 531-535 by an amount according to the rotational speed of each of the individual fans 531-535. The aggregation of the mist 311 blown to the upper side of each of the individual fans 531-535 forms a screen 315 (also called mist screen).;COPYRIGHT: (C)2015,JPO&INPIT
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